import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.JToolBar;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

public class DocumentModel {
  public static void main(String[] args) {
    final StyledDocument doc;
    final JTextPane textpane;

    JFrame f = new JFrame();

    f.setTitle("Document Model");

    JToolBar toolbar = new JToolBar();
    JButton boldb = new JButton("bold");
    JButton italb = new JButton("italic");
    JButton strib = new JButton("strike");
    JButton undeb = new JButton("underline");

    toolbar.add(boldb);
    toolbar.add(italb);
    toolbar.add(strib);
    toolbar.add(undeb);

    f.add(toolbar, BorderLayout.NORTH);

    JPanel panel = new JPanel();
    panel.setLayout(new BorderLayout());
    panel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

    JScrollPane pane = new JScrollPane();
    textpane = new JTextPane();
    textpane.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));

    doc = textpane.getStyledDocument();

    Style style = textpane.addStyle("Bold", null);
    StyleConstants.setBold(style, true);

    style = textpane.addStyle("Italic", null);
    StyleConstants.setItalic(style, true);

    style = textpane.addStyle("Underline", null);
    StyleConstants.setUnderline(style, true);

    style = textpane.addStyle("Strike", null);
    StyleConstants.setStrikeThrough(style, true);

    boldb.addActionListener(new ActionListener() {

      public void actionPerformed(ActionEvent e) {
        doc.setCharacterAttributes(textpane.getSelectionStart(), textpane.getSelectionEnd()
            - textpane.getSelectionStart(), textpane.getStyle("Bold"), false);
      }
    });

    italb.addActionListener(new ActionListener() {

      public void actionPerformed(ActionEvent e) {
        doc.setCharacterAttributes(textpane.getSelectionStart(), textpane.getSelectionEnd()
            - textpane.getSelectionStart(), textpane.getStyle("Italic"), false);
      }

    });

    strib.addActionListener(new ActionListener() {

      public void actionPerformed(ActionEvent e) {
        doc.setCharacterAttributes(textpane.getSelectionStart(), textpane.getSelectionEnd()
            - textpane.getSelectionStart(), textpane.getStyle("Strike"), false);
      }

    });

    undeb.addActionListener(new ActionListener() {

      public void actionPerformed(ActionEvent e) {
        doc.setCharacterAttributes(textpane.getSelectionStart(), textpane.getSelectionEnd()
            - textpane.getSelectionStart(), textpane.getStyle("Underline"), false);
      }
    });

    pane.getViewport().add(textpane);
    panel.add(pane);

    f.add(panel);

    f.setSize(new Dimension(380, 320));
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);

  }
}